IPA: //ˈdæstərdlinəs//
KK: /ˈdæstərdliːnəs/
The quality of being cowardly or treacherous, often involving deceitful or dishonorable behavior.
His dastardliness was evident when he betrayed his friends for personal gain.
Dastardliness → It is formed from "dastard" (from Old French *dastard*, meaning coward) and the suffix "-liness" (meaning the quality of being). The word "dastardliness" refers to the quality of being cowardly or treacherous.
Think of the word 'dastard' which means cowardly, and remember that 'dastardliness' describes the quality of being cowardly.